Question about 2004 Chevrolet Cavalier

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Suspect timing chain has jumped, is there a way to verify the timing marlks without taking off the lower cover(valve cover already off).

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Check compression. if its low (below 125psi) its most likeky jumped. Usually it wont sound normal when turning the engine over. it it has jumped, you will have bent valves. If any rocker arms are loose, you have bent valves.

Posted on Jan 03, 2011


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How to take timing chain cover off of 2.5 altima 2003

Have to remove variable valve timing cover, alternator, ps pump, tensioner, a/c compressor, motor mount and bracket, upper and lower oil pan, crankshaft pulley. I just replaced my timing chain- Not a job for a beginner, took a VERY long time. Recommended to support engine and remove subframe but not totally necessary.

Oct 02, 2014 | 2003 Nissan Altima

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What would make a 2002 2.2l cavalier turn over but wont start

If there is was no check engine light prior to the problem (which would normally indicate sensor problems), then I would suspect that the engine has jumped time. The 2.2L engines, although they have a timing chain and not a belt, had issues with the timing chain tensioner. This wars out, breaks, and allows the timing chain to jump across the gear teeth, putting the engine out of time. This will cause a no-start condition, and if bad enough, cause valve damage that will require the heads to be repaired. The easiest way to check for this problem is to perform a compression check of the cylinders. If the engine has jumped time, the compression in the cylinders will vary greatly from one cylinder to the next and will most likely be lower than normal.

Mar 19, 2014 | 2002 Chevrolet Cavalier Coupe

1 Answer

Is there a way to check the timing chain without removing the cover ( this is quite a job) for a look at the timing marks

no way of doing so. need to remove cover. i have been doing this since 1996 and have never seen chain driven nissan jump timing. have seen some timing belt cars jump, but never chain driven engines. i think you have something else going on. i have done many and many timing chain jobs on frontiers and maximas, but not for a timing chain jumping issue. upper timing chain shoes wear out and engine gets noisy. i have to say i have seen some with the primary chain stretched a bit, but car still ran fine.

Sep 12, 2012 | 2005 Nissan Frontier

1 Answer

Issue with timing chain

HE needs to stop trying to start the engine if it keeps jumping time. Replace the tensioner or make sure the older one is installed correctly by the book. If he keeps trying to start the engine and jumping time and the cam shaft has a valve open in the head a piston can com up and hit the valve and then the valve will be bent. And you will be screwed and a head rebuild will be in your future. I have been a Certified Mechanic for over 25 years and if this guy is truly certified he should not be having this problem. Make sure he is and has the shop manual for your car. If not purchase a chiltons manual for your car specifically. May cost you $20.00 it will have the info he needs and throw it at him. A lot of times it is best to replace the tensioner when doing a timing chain repair. You already have the engine timing cover and other parts off the front of the engine. If there is any play in the bearings of the tensioner replace it.

Jul 23, 2012 | 2003 Nissan Altima

1 Answer

Can you check condition of timing chain on V6 without any dismantling of engine?

not that i know of you may have acces if u remove the rocker covers if the chain is streched it will be noisey if it jumps a tooth on the drive sprockets it can cause terminal damage or at the least bend valves best to have a mechanic take a look at it and go from there

Apr 06, 2011 | 1999 Suzuki Vitara

1 Answer

How do you tell if an engine has jumped valve timing (not ignition timing)?

Essentially, since the valves and distributor are both driven by the camshaft (via the timing chain), both are equally affected by anything that happens to the chain. Chains don't actually "jump time"
but most often will stretch out and cause the cam and distributor to lag behind the crankshaft so the pistons are out of phase with them. That causes lower and lower actual compression and later and later spark, resulting in poor power output and in extreme cases, a piston can actually touch and bend a lagging valve. If an engine is fitted with an aluminum cam gear, the gear teeth are nylon. As the gear turns, an excessively worn chain will ride up and strip off the teeth.
The best way to check is to remove the valve cover and watch the rocker arms on #1 cylinder. Both valves should be completely closed when the engine is turned to the top dead center (0) position on the timing scale and the distributor rotor should point to the #1 tower on the distributor cap. (will also point exactly 180 degrees away from it if on the exhaust stroke)
Very low compression readings in all cylinders and a rotor that "stutters when the engine is cranking are other common symptoms)
If you have those symptoms, the next thing to do is remove the timing case cover and look at the chain. if the engine has 200K miles or better, I'd replace the chain, as at that point, most chains have sufficient wear to justify replacement even in engines that seem to be running well.
This answers your question but may not solve your problem as your post leads me to believe there is something other than a valve timing issue going on there.

Feb 08, 2011 | 1990 Jeep Wrangler

1 Answer

Clicking sound when running i suspect the upper and lower lifters

You have done the right thing pertaining to your oil change and additive. One item that is important though is to get a definitive "read" on what the actual oil pressure is. if you have a dash gauge, it's electro-mechanical and not quite as accurate as a fully mechanical gauge. You can get a good "ball-park" idea of the pressure using the one on the dash though (if you only have a light, have a mechanical gauge installed even temporarily, to get some #s to work with) You should have a normal hot pressure of at least 25-35 lbs in most Jeep engines. Most run higher at about 45psi. If you have low pressure, I'd suspect that you have either rod or crank bearing wear. If pressure is normal, then you have a sticking lifter, worn cam or worn rocker arm. You can more accurately locate the noise source by using a short length of hose and with one end on your ear, put the other end against various parts of the engine 'till the noise is loudest. If it seems to be in the oil pan, then suspect bearings, if up on top under valve covers, suspect something in the valve train.
If you just changed the oil, sometimes it takes time to dissolve deposits. It took time to create them. If the noise is in the valve cover, I'd let it go for a while and see if it begins to go away. If it's in the pan area, have it looked at now. Rod bearings can be changed at the very beginning of wear...otherwise, if let go too long, the engine will need to come completely apart to do that correctly and is very expensive. If the noise is identified by a competent shop as "piston slap" most times there is really nothing you can do to correct it without some major work. But, an engine can run like that for a very long time and have no real problems other than the noise. it takes years of experience to determine what is going on inside the engine without tearing it apart. Only trust a long time tech with many years in the business for an opinion. It is something that can only be learned by hearing and verifying noises over many many years.
good luck

Dec 15, 2009 | 1997 Jeep Grand Cherokee

1 Answer


I would recommend buying a shop manual from any auto store.

If you are asking than chances are you do not have the required tools to remove the crankshaft bolt.

Remove the valve cover and verify engine is TDC
Remove all accessory belts
Remove the engine mount on the side of your accessory belts
Remove upper and lower timing chaing covers
Using a 24" 1/2" extension along with a breaker bar and crank shaft holder remove the crankshaft bolt
Remove the timing chain tensioner and remove the timing chain
It is a good idea to replace the water pump and all oil seals while doing this job.

Align all marks (balance shaft, crank, cram, and water pump if it has one) and install in reverse order.

By hand this should take 2-3 hours with the right tools
With air tools this should take 1 hour for the average joe or at least it only takes me 45 min to an hour.

Aug 16, 2008 | 2000 Toyota Corolla

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